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There are some caveats. I read a few years ago that Cummins will make the same HP up to 10,000'. I've seen Ecoboost issues reported at altitude. The turbo has to work more to keep the same PSI. In real world tests, the Hemi (5.7l) has done as good or better at altitude vs the Ecoboost.
From personal experience, I had a Silverado (5.3l) rental truck in Denver. That thing was struggling to climb. It was so bad, I even popped the hood to check what engine was under it. I thought it had the smaller V8.
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(SOLD) 2015 Keystone Passport 2810BH
2013 Ram 1500 Hemi 8-speed 3.92 Air Suspension
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